NINA, F. M. JAMALUDIN1 AND NORAZWINA ZAINOL
Abstract
In this study, the best treatment condition of poultry manure wastewater (PMW) was determined for the purpose of improving biogas production by using two-level full factorial design. Five factors were chosen for factorial screening namely: agitation, reaction time, type of soil, soil to water ratio and PMW to soil water (SW) ratio. Based on main effect analysis, agitation gave highest contribution at 38.36%. In term of interaction, agitation and reaction time gave the highest contribution at 3.33% contribution. The best treatment condition suggested by Design Expert software was using poultry soil as source of soil at soil to water ratio 1:6, and mixed with PMW at 1:4 ratio without agitation for 5 hours reaction time. Application of this best condition showed improvement in biogas yield by 82 % where biogas yield was up to 0.0248 L/g COD by using treated PMW compared to only 0.0045 L/g COD by using untreated PMW.